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Implicit Collusion in Non-Exclusive Contracting under Adverse Selection

  • Han, Seungjin

This paper studies how implicit collusion may take place through simple non-exclusive contracting under adverse selection when multiple buyers (e.g., entrepreneurs with risky projects) non-exclusively contract with multiple firms (e.g., banks). It shows that any price schedule can be supported as equilibrium terms of trade in the market if each firm's expected profit is no less than its reservation profit. Firms sustain collusive outcomes through the triggering trading mechanism in which they change their terms of trade contingent only on buyers' reports on the lowest average price that the deviating firm's trading mechanism would induce. It suggests that a good can be overpriced in a competitive market even with fully rational traders and without firms' explicit collusive agreement.

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File URL: http://socserv.socsci.mcmaster.ca/han/research/CNE_7.pdf
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Paper provided by Vancouver School of Economics in its series Microeconomics.ca working papers with number seungjin_han-2011-10.

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Length: 24 pages
Date of creation: 26 May 2011
Date of revision: 02 Apr 2013
Handle: RePEc:ubc:pmicro:seungjin_han-2011-10
Contact details of provider: Web page: http://www.economics.ubc.ca/

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  1. Laurence Ales, 2009. "Adverse Selection and Non-exclusive Contracts," 2009 Meeting Papers 854, Society for Economic Dynamics.
  2. Peters, Michael & Troncoso-Valverde, Cristian, 2010. "A Folk Theorem for Competing Mechanisms," Microeconomics.ca working papers michael_peters-2010-17, Vancouver School of Economics, revised 19 Oct 2013.
  3. Alessandro Pavan & Giacomo Calzolari, 2010. "Truthful Revelation Mechanisms for Simultaneous Common Agency Games," American Economic Journal: Microeconomics, American Economic Association, vol. 2(2), pages 132-90, May.
  4. David Martimort & Lars Stole, 2001. "The Revelation and Delegation Principles in Common Agency Games," CESifo Working Paper Series 575, CESifo Group Munich.
  5. Andrea Attar & Thomas Mariotti & François Salanié, 2010. "Non-Exclusive Competition in the Market for Lemons," CEIS Research Paper 159, Tor Vergata University, CEIS, revised 28 May 2010.
  6. Rothschild, Michael & Stiglitz, Joseph E, 1976. "Equilibrium in Competitive Insurance Markets: An Essay on the Economics of Imperfect Information," The Quarterly Journal of Economics, MIT Press, vol. 90(4), pages 630-49, November.
  7. Epstein, Larry G. & Peters, Michael, 1999. "A Revelation Principle for Competing Mechanisms," Journal of Economic Theory, Elsevier, vol. 88(1), pages 119-160, September.
  8. Myerson, Roger B., 1982. "Optimal coordination mechanisms in generalized principal-agent problems," Journal of Mathematical Economics, Elsevier, vol. 10(1), pages 67-81, June.
  9. Jaynes, Gerald David, 1978. "Equilibria in monopolistically competitive insurance markets," Journal of Economic Theory, Elsevier, vol. 19(2), pages 394-422, December.
  10. Hellwig, Martin F., 1988. "A note on the specification of interfirm communication in insurance markets with adverse selection," Journal of Economic Theory, Elsevier, vol. 46(1), pages 154-163, October.
  11. Bruno Biais & David Martimort & Jean-Charles Rochet, 2000. "Competing Mechanisms in a Common Value Environment," Econometrica, Econometric Society, vol. 68(4), pages 799-838, July.
  12. Andrea Attar & Thomas Mariotti & François Salanié, 2011. "Non-Exclusive Competition under Adverse Selection," CEIS Research Paper 192, Tor Vergata University, CEIS, revised 31 Mar 2011.
  13. Akerlof, George A, 1970. "The Market for 'Lemons': Quality Uncertainty and the Market Mechanism," The Quarterly Journal of Economics, MIT Press, vol. 84(3), pages 488-500, August.
  14. Han, Seungjin, 2006. "Menu theorems for bilateral contracting," Journal of Economic Theory, Elsevier, vol. 131(1), pages 157-178, November.
  15. Michael Peters, 1999. "Common Agency and the Revelation Principle," Working Papers peters-99-01, University of Toronto, Department of Economics.
  16. Pavan, Alessandro & Calzolari, Giacomo, 2009. "Sequential contracting with multiple principals," Journal of Economic Theory, Elsevier, vol. 144(2), pages 503-531, March.
  17. Takuro Yamashita, 2010. "Mechanism Games With Multiple Principals and Three or More Agents," Econometrica, Econometric Society, vol. 78(2), pages 791-801, 03.
  18. Attar, Andrea & Campioni, Eloisa & Piaser, Gwenaël, 2013. "Two-sided communication in competing mechanism games," Journal of Mathematical Economics, Elsevier, vol. 49(1), pages 62-70.
  19. Han, Seungjin, 2007. "Strongly robust equilibrium and competing-mechanism games," Journal of Economic Theory, Elsevier, vol. 137(1), pages 610-626, November.
  20. Gerald D. Jaynes, 2011. "Equilibrium and Strategic Communication in the Adverse Selection Insurance Model," Levine's Working Paper Archive 786969000000000243, David K. Levine.
  21. Jaynes, Gerald D., 2011. "Equilibrium and Strategic Communication in the Adverse Selection Insurance Model," Working Papers 91, Yale University, Department of Economics.
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